Improvement-in sewing



2 Sheets-Sh33H G. W. BAKER.

Sewing-Machine.

Patented July 30,1872,

U M M/M/ GEORGE W. BAKER, OF CLEVELAND, OHIO, ASSIGNOR TC WILSONSEWING-MACHINE COMPANY AND WHITE MANUFACTURING COMPANY, OF SAME PLACE.

IMPROVEMENT l hi @Ehllihlfi hdthitiitlES.

Specification forming part of Letters Patent No. lltql fibfiltfi, datedJuly 30, 1872.

To whom it may concern:

Be it known that I, GEORGE W. BAKER, of Cleveland, Cuyaltoga county,Ohio, have inyrented certain new and useful Improvements g inSewing-Machines, of which the followingis a specification: Thisinvention consists of certain improvements in the tension, take-up, feedmechan ism, shuttle-race, ahd mechanism for driving the needle-arm andshuttle, which will be described in the ord named.

In the accompai ying drawing, Figure 1 is a perspective view of amachine made. in ac eordance with my invention. Fig. 2 is a plan of. theunder side of the same. Fig. 3 is a view of the shuttle-race detached.Fig. 4 is a like view of the shuttle carrier or driver. Fig. 5isa frontview of the head of the goose neck with the face-plate removed. Fig. 6is an elevation of the machine. Fig. 7 is a vertical section of aportion of the cloth-plate, through the feed, and in a plane in the lineof feed. Fig. Sis a plan view of the tensionspring detached Theimprovement in the tension relates to the pressure-spring. In lieu ofusing aspiral,

, volute, or other ordinary form of spring, I employ a disk, A, Figs. 1,5, 8, made of spring metal, with a hole, a, in its center for the pas--sage of the'screw-stem b of the tension, and with long spring-fingers 0,formed by cutting in the disk eecentric slits or slots, extending fromthe exterior of the disk toward the central hole a. These fingers arebent down so that when the spring is in place their tips will rest onthe tension, as shown in Figtmfia.

The form of these fingers may be somewhat varied; but, as seen in thedrawing, they .should all start from near the central opening a, andthen follow a curved path, so as to obtain considerable length, in orderto. have the necessary spring action without making the 'device toolarge. They should preferably taper toward their outer ends. A springthus made possesses considerable advantages. It

i is very compact and admits of the pressure beingevenly applied. As theadjusting-nut cl bears upon the spring at a point within the compass ofthe spring-fingers, the latter, at

the points where they bear upon the tension, are enabled to operateequally and to the best advantage. I prefer to interpose a cloth,,rub'her, or other suitable washer, a, between the 'sprin g and the tensionsheave or plate, although this washer is not indispensable.

The -improvement in the take-up consists principally in theinstrumentalities for holdin g and adjusting it in order to take up moreor less slack thread, as required for thin or thick goods. The devicesare shown clearly in Figs. 1 and 5. They are for the greater partinclosed within the head B of the ma chine-the only parts projectingbeing the end of the take-up lever and the adjusting and holding nut.The take-up lever consists of an angle or bell-crank lever, C, thelonger arm of which, provided at the end wit-l1 a thread-eye, partlyprojects from the side of the head, andis arranged to work up and downin a vertical slot formed in the same. The shorter arm of the lever isconnected with the reciprocating needle-bar D by a link, f, by means ofwhich connection the proper movements of the take-up at the proper timesare imparted from the needie-bar. The takeup lever, at its angle, ispivoted to a block, g, the face of which is held tightly against theinner face of the side of the head B by means of a nut, h, screwing fromthe outside of the head .onto a screwstem, *5, attached to the block,and projecting through the head. To allow the adjustment of the take-upso as to adapt it to draw up moreor lessthread, as desired, a verticalslot, j, is formed in the head B, through which the lstemamasses, andthe hlopk ncam by loosening the nut h, be adj nsted up or down to anypoint within the limits determined by the length of the slot, and canthere be held by tightening up the nut. Raising the block in creases thelength of movement of the takeup; lowering it decreases the range ofmovement.

.This arrangement is compact and simple; all the parts of ,the take-up,excepting only those actually required to be exposed, are concealed, andthe samedevice serves not only to support and hold, but also to adjustthe takeup lever.

The needle-barl) plays up and down through spirally-slotted bushings kat thctop anti not tom of the head B. These bushings, which are bothremovable and adjustable, are insertegi in cylindrical openings in thehead, and are combined with set-screws k in ihe'face-plate of the head,which are arranged to have their points in contact with thebnshings..ihe slots L which split or divide the bushings on one side, extend fromtop to bottom of the same, and instead of being vertical are inclined.or pursues spiral course partly around; the hush ings. The' object ofthe bushings is to prevent the needle-bar from wearing the hole in thehead through which it passes, and,owing to the slots k, if cit-her theneedle-bar or the bushings wear, the screws is can be set up so as tocompress the bushings, bringing the edges of the slots closer together,and thus tighten the bushings so as to take up all wear. Byniaking theslots of the bushings spiral there is no danger of raising afin or ribon the needle-bar, which is liable to occur when the slots are madestraight up and down.

it has been my object in thcfeed mechanism to simplify it and to employas few parts as possible. It consists of a feed-bar, l, to which thefeed-surface l is attache-(l. The arrangementfoi' thi s bar isshowninFig.7, It is held to the underside of the cloth-plate by a yoke orstrap, i at one end, while the feed-surface at the other end is in arecess formed for itin the topoigthc cloth-plate. A spring, in, iscmployed to givethebaclr and-down motionsto the feed. Anadiusting-screw, 12,011 the end oft-he fceil-bor'serves to regulatethcextentto which the spring shall retract the bar, tliusilctcrmin ingthe length of the feed. The up movement of the feed, to project thefeed-surface above the clothplate, is caused by the rod E which isconnected by a strap with the eccitric F on the driving-shaft G, and hasits 0 or end supported in a ,rockeohearing, B, through, which it freelyshoes. The eccentric revolves in thedirccticn indicated by arrow in Fig.6, and when its most eccentric portion is above the shaft, in theposition it occupies when the feed is just about to move forward, theconnecting-rod E will be drawn up toward the clothplate, so as to pressupward on the feedoar and force the fcelisurlace above the cloth. Thispressure of the rod upon the bar continues until the feed has takenplace, at which time the most eccentric portion of the eccentric beginsto come below the shaft G, and the rod E,

' is consequently lowered, so as to permit the spring m to ilraw downthe feed-sufl'ace. The forward movement of the feed is efi'ecteii by alink, I, jointed to a sleeve, I, fixed on the conneciing roil, (whichsleeve is the part of the rod that bears on the feeriha-r to move itupward,) and provided at its outer end. with a slot, p, in which isreceived. a pin, 0, on the feed-bar. The-forward movement of the rorlv Ewill cause the link to advance, and the end. of the slot p nearest theconnectin -roil is. brought, sooner or later, iul contoct with the pin0, according to the adjustment of the nut 12. If the nut is ailjustc lfor a long feed, the link operates upon the pin sooner than it would incase the adjustment were for a short feed. In lieu of casting theshuttlemace and of fermanently uniting it with the under side of theclothplates, I strike it up out of metal, as shownat J, Fig. 3, with aflange, r, to attach it to the cloth-plate, slotted atr for the possageof the feed-bar, a concave portion, s, to

receive the shuttle and shuttle-driver, and a slot, t, so that it may bealways kept free of dirt and refose,= which can escape at once throughthe slot. The holes 0", through which the holding-screws 8 pass, areelongatcd,so-

as to permit the adjustment lengthwise of the race whenever desired. Atthe ends of the slot are fingers or projections t, which bear againstthe Way or ledge K on the under side of the bed-plate, this lodgeclosing the shuttic-race on the ilat side of the shuttle. The

race is set against the side oi one of the two ways K in which theshuttlecriver slide moves, and is there held by means of the screws 8',which pass through the flange 1" into the cloth-plate. The shuttle isshown at v, the shuttle-driver at c, and also separately in Fig. 4, andthe shuttle-driver sli le at v. This slide is connected with an arm,'won crankpin 10 of shaft G, by a rod, w. Of the two ways or groovedpieces K L, between'whicli the shuttle-driver slide r moves, the outerone L is removable and adjustable nearer to or further from the other,this being efi'ecteil' by providing it with cars as, slotted transverse-1y to the length of the piece, through which holding-screws .r pass intothe cloth-plate. By reason of this arrangement the piece L can be set uptoward the other, K, so as to take up all wear and. cause the slide tomove evenly and with out noise or lateral movement, while it admits alsoof the parts being taken apart to clean this portion of the machine withgreater facility. The mech anism for driving the needle-arm consists ofthe crank-pin w fixed on a disk, 3/, attached. to shaft G, and theheart-shaped cam 2 formed in the lower end of the vertical portion ofthe angle-lever needle-arm 0, which arm is pivoted at its angle P to thestandard of the machine. The

crank moves in the direction of the arrow,

and the arrangement of parts is such that the descent of the needle isefl'ected during that portion of the movement when the crank-pin ispassing fromv the point 2' through the lower portion of. the cam-slot.The advantage of this arrangement is, that the descent of the needle topierce the cloth takes place at a time when the operative length of thevertical arm of the lever U is continually increasing, so'

that the descent is slower and more gradual, and more power is obtainedthan would be the case were the shaft or crank to revolve in an oppositedirection, and consequently the needle to descend when the operativeien'gth of the vertical arm of lever 0 was continually decreasing, forthis would cause a more rapid,

tan ent 3 but propcrtionately less powerful, descent. arrangement sf themechanism requires the shnttle a te be pointed outward or away from thedriving-shaft G- instead of toward it, as has hitherto been the practicein the ma chine -the Wilson sewing-machine to which censisting of a diskwith eccentricaily-curved and dewnwardiybent sprin g-fin gers, the Wholebeing constructed substantially as shown and described.

2. The take-up lever operated from the neediebar, as specified, andpivoted to a mowable block within the head of the machine, incembination with a screwstem extending through a. vertical slot inthehead and an adjusting and chi-sapling net on theexterior of the head,under the arrangement shown and described, so that the said nut and stemmay serve as a means both of moving the block up and down and oiciamping it in position. a r

The slotted link, intermediate between and connected and operating inconjunction with the feed-bar, and the reciprocating rod E,substantially as shown and set forth.

,4. The shuttle-race, struck up from metal and formed, as hereindescribed, with a concave bed to receive the shuttle, a holdingfiangeslotted to permit the passage of the feedbar, and with elongated pin orscrew holes to permit its being fastened to and adjusted lengthwise onthe bed-plate of the machine, a slot for escape of refuse and dirt fromthe bed, and projections or bearings t, substantially as shown anddescribed.

5. In combination with the needle-arm, its heart-sh aped cam groove orslot, and the crankpin of the driving-shaft; operating together asspecified, so that the deseent of the needle takes place when thecrank-pin traverses the lower portion of the slot, I claim anoutwardly-pointed shuttle, arranged and operated from said crank-pin,substantially as herein shown and set forth.

In testimony whereof I have signed my name to this specification beforetwo .sub-

scribing witnesses.

' GEORGE W. BAKER. Witnessesr A. ZEHRING, '1. B. LINDSAY.

